One of the Oklahoma teens who allegedly gunned down an Australian student “because he was bored” tweeted “it’s time to start taken life’s” in the days before the murder.

James Edwards Jr., 15, tweeted the disturbing message three days before 23-year-old Christopher Lane was shot dead has he jogged down a Duncan., Okla. road.

“90% of white ppl are nasty. #HATE THEM.” Edwards tweeted in April.

Edwards and Chancey Allen Luna, 16, have been charged with murder while Michael Dwayne Jones, 17, who was driving the car they were in, was charged with accessory after the fact to murder.

Police said the teens told them they were bored, so they decided to kill somebody.

Meanwhile, it’s been revealed the teens were quickly nabbed because they allegedly threatened to murder a 17-year-old who wouldn’t join their offshoot of the Crips gang.

Christopher Johnson received the death threat via Facebook two hours after the teens gunned down Lane, Johnson’s father said.

“My son called me and said, ‘They’re saying they’re coming to kill me,’ so I called the police and they got here within about three minutes,” James Johnson told Australia’s Herald Sun newspaper.

Cops found Edwards Jr., Jones, and Luna in a car in Duncan’s Immanuel Baptist Church parking lot, near the Johnsons’ home, Friday afternoon.

Authorities said Jones confessed to helping his accomplices pick Lane at random victim, as he jogged in Duncan, and fatally shoot him because “we were bored and didn’t have anything to do.”

James Johnson said his son attends Duncan HS with Edwards and Luna.

“They threatened to kill my son because they are in a gang, the Crips, and were trying to get my son in it and I wouldn’t let him do it,” he said. “I told him he couldn’t run with these boys. He’s a little terrified.”

Yesterday public schools in the town of 24,000 were on heightened alert after police said they learned of anonymous threats.

Terrell Cox, 16, a student at Duncan High, said the suspects were a “stand-off group that didn’t seem to care that much.”

Lane’s grieving girlfriend, Sarah Harper, wrote on Facebook that Lane’s killers should “rot in Hell”.

“No one deserves to die that way. Not even the boys involved,” Harper wrote.

“Don’t get me wrong, I want them to rot in Hell, but no one should be blindly taken from the back so unexpectedly and without any reason.”

Harper told CNN she was still coming to terms with the senseless killing.

“There is no way to describe what happened,” she said. “It’s the hardest thing you could ever imagine happening. There is still a lot of shock and disbelief, and a lot of anger and sadness.”

“You can’t make sense of it,” she said. “It’s just — so surreal that anybody could do something like this.”

Harper said Lane was “the most genuine and kind-hearted guy and would do anything for anybody at any time.”

Details of Lane’s final moments emerged from a 911 call.

“He just fell over in a ditch and there’s blood on him,” said a woman who drove by after the shooting. “He’s turning blue,” she added.

Prosecutor Jason Hicks said Edwards took his arrest so casually that he was videotaped by police “doing a little dance” when he was booked for murder.

Luna and Edwards face life in prison without parole if convicted of first-degree murder charges.